Hello!

On Wed, Nov 18, 2015 at 09:40:45PM -0500, semseoymas wrote:

> First, the specs:
> nginx version: nginx/1.8.0

[...]

> The problem here: if people asks nginx for the same request_uri, it will
> create multiple files!! this way, the cache is not running ok...

Multiple cache files for the same key can be created if a backend
response uses the Vary mechanism to allow multiple resource
variants. It is supported and taken into account when caching
since nginx 1.7.7, http://nginx.org/en/CHANGES:

*) Change: now nginx takes into account the "Vary" header line in a
backend response while caching.

If responses are really the same, consider removing Vary from
backend responses. If it not possible for some reason, you can
use proxy_ignore_headers to stop nginx from handling Vary in
responses, e.g.:

proxy_ignore_headers Vary;

Some additional details can be found in the documentation here:

http://nginx.org/r/proxy_ignore_headers

--
Maxim Dounin
http://nginx.org/

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